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Spin current injection from sputtered yttrium iron garnet (YIG) films into anadjacent platinum layer has been investigated by means of the spin pumping andthe spin Seebeck effects. Films with a thickness of 83 and 96 nanometers werefabricated by on-axis magnetron rf sputtering at room temperature andsubsequent post-annealing. From the frequency dependence of the ferromagneticresonance linewidth, the damping constant has been estimated to be$(7.0\pm1.0)\times 10^{-4}$. Magnitudes of the spin current generated by thespin pumping and the spin Seebeck effect are of the same order as values forYIG films prepared by liquid phase epitaxy. The efficient spin currentinjection can be ascribed to a good YIG|Pt interface, which is confirmed by thelarge spin-mixing conductance $(2.0\pm0.2)\times 10^{18}$ m$^{-2}$.

Spin current generation from sputtered Y3Fe5O12 films